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Full Duplex

Enhanced Definition

Full Duplex is a communication mode that allows simultaneous, two-way data transmission between two connected devices. In the mainframe context, this means data can be sent from a z/OS system and received by it concurrently over a single communication link, significantly improving efficiency and throughput compared to half-duplex.

Key Characteristics

- Simultaneous Transmission: Data can be sent from device A to device B while device B simultaneously sends data to device A, eliminating wait times.
- Dedicated Paths: Conceptually or physically, separate paths or channels are used for sending and receiving data, preventing collisions and ensuring continuous data flow.
- Enhanced Throughput: Maximizes the utilization of the communication link by allowing both directions of data transfer to occur at the same time.
- Reduced Latency: Interactive applications benefit from quicker response times as acknowledgments and new data can travel concurrently, improving user experience.
- Common in Modern Networking: Standard for OSA-Express adapters on z/OS and most modern Ethernet networks connecting mainframes to the broader enterprise network.
- Negotiated Mode: Typically negotiated between the communicating devices (e.g., OSA-Express port and network switch) during link establishment.

Use Cases

- OSA-Express Network Adapters: Configuring OSA-Express ports for full-duplex operation to connect z/OS LPARs to enterprise IP networks, enabling high-speed TCP/IP communication for applications like DB2 clients, CICS web services, and FTP.
- **CTC (Channel-to